Boat



12, 1929'. 7 1,701,925 G. G. KESEVALTER BOAT Filed Jan. 24, 1928 GEORG'E G. K/SEVAUER INVENTOR BY 90/1; fl MM ATTORNEY Patented Feb. 2,1929.

- UNITED STATES.

. GEORGE G. KISEVALTER, OF NEW YORK, N. Y;

Boar."

Application filed January 24,1928. Serial No. 249,072.

My invention relates to boats and has a.

particular reference to boats of augliding type or hydroplanes.

A large proportion of power in ordinary boats' is used for overcoming frictional resistance of water. This resistance is proportional to the submerged surface, and in hydroplanes it is greatly reduced at high speeds due to the special design of the hull enabling it to rise above the surface of water.

In order to obtain the same result also at lower speeds I am using in my boat a special propelling device which lifts the forward portion of the boat out of water. This propelling device consists of a large paddle wheel extending across the hull of the boat and pro-v vided with specially shaped paddles or vanes which partly lift and partly propel the boat. Similar wheels may be also employed as glid- 9 ing devices to enable the boat' to rise when an ordinary propelling device is used, such as a screw propeller.

accompanying specification and drawing in Fig. 1 is an elevation of my boat, Fig. 2 is atop view of same, Fig. 3 is anelevation of a modified arrangement, and Fig. 4 is another modification.

tially flat bottom 2. It may be provided with steps 3 of a type used in ordinary hydroplanes in order to facilitate rising of the hull out of water at high speeds.

In the middle portion of the boat and preferably near the bow a transverse chamber at is provided, open at the bottom and adapted to enclose the upper portion of a paddle wheel 5. This wheel extends from one side of the boat to theother and has paddles 6 arranged spirally at the periphery of the wheel. They are curved so as to meet the surface of water without a shock and to leave at the rear without raising any appreciable waves.

The paddle wheel 5 is mounted on a shaft 7 supported in bearings 8 and is driven by an engine 8 through a suitable transmission, such as a chain 9. An air rudder 10 may be pro- My boat consists of a hull 1 with a substanoperated from a steering column and wheel 12 by meansof rods and cables 13.

The paddle wheel is made of a larger di ameter in the middle, being of a barrel-like shape, so as to facilitate its rotation in water.

The operation of my boat is'as follows.

With a suflicientlyhigh speed .of rotation of the paddle wheel, a vertical pressure com ponent is created which tends to lift the hull of the'boat out of water. A horizontal com- 0 ponent force tends'to propel the boat, and as the lifting force depends principally on the rotation of the paddle wheel, it follows, that j the boat may be largely raised out of water even at low speeds, thereby reducing the frictional resistance and enabling'it to move at a high-rat of speed. The power expenditure is also re uced thereby rendering this boat more economical at low speeds.

It is important that the paddles or vanes b curved as shown, forming spirally shaped I steps on the periphery of the wheel. My invention is more fully described in the A modified arrangement is shown in Fig. 3 of a boat with a second smaller wheel 14.- pivotally mounted in a forked shaft 15 supported in suitable hearings in the sternof the boat. The second wheel acts as arudder and is operated by the steering wheel 16.

The paddle wheel 5 may be disconnected from the engine, and the latter may be made to operate an ordinary screw propeller 17. The wheel in this case acts as a roller and tends to lift the hull out of water at medium and high speeds of the boat. a

At very high speeds the hull rises from the water and glides on air in a manner similar to operation of ordinary hydroplanes. Steps 3 entrain air under the hull thereby reducing' frictional resistance and correspondingly increasing the speed of the boat.

Important advantages of my invention are that it enables the boat to rise out of water and to skim on its surface at practically any speeds of the boatthereby reducing the losses due to water friction and resistance.

draft of the boat may be made very small so that it is practicable to use my boat in shallow waters. The paddle wheel of my boat, to be effective,musthave its blades or floats curved from The '2 i T 1,701,925 I the periphery toward the center and in a dibuoyant paddle Wheel, and a plurality of perection of rotation, the operating surface of ripheral. tooth projections on said wheel, the 1 each float being convex. The paddle wheel surfaces of said projections being convex may be made as a watertight drum, the blades from the front to the rear.

5 or floats forming an uninterrupted surface Signed at New York, in the county of New with steps 01" depressions; York and State of New York, this 21st day of I claim as my invention: January A. D. 1928. In a. boat, the combination with a. hull, of a GEORGE G. KISEVALTER. 

